Hot-blast stove.



P. J. BROWN.

HOT BLAST STOVE.

APPLICATION FILED MAR.20. m3.

LMQ WO Patented May 25, 1915.

5 SHEETSSHEET I.

63% 3 am m W, I 5y P. 1. BROWN.

HOT BLAST STOVE.

APPLICATION FILED MAR.20,1913.

1 1%@ 8?20 Patented May 25, 1915.

5 SHEETS-SHEET 2. ,z.

P. J. BROWN.

HOT BLAST STOVE.

APPLICATION FILED MAR. 20, 1913.

Patented May. 25, 1915.

5 SHEETS-SHEET 3.

P. J. BROWN.

HOT BLAST STOVE.

APPLICATION FILED MAR. 20. 1913.

1 1% 8?2B Patented May 25, 1915.

5 SHEETS-SHEET 4.

3 23M, gvgvfl P. J. BROWN.

HOT BLAST STOVE.

APPLICATION FILED MAR. 20, 1913.

Patented ay 25, 1915.

5 SHEETS-SHEET 5.

PATRICK J. BROWN, OF CLEVELAND, OHIO.

HOT-BLAST STOVE.

Application filed March 20, 1913.

Stoves, of which the following is a specifica tion.

This invention comprises an improved regenerative furnace of the type more commonly known in blastfurnace practice as a hot blast stove. all substantially as herein shown and described and more particularly pointed out in the claims.

In lieu of following the general practice of using'special forms of brick, my aim is to construct a very etlicicnt hot blast stove at less cost than at present by using a com mon rectangular form of brick which is kept in stock by many dealers and therefore immediately obtainable on demand.

My object also is to construct a stove which will be easy and economical to repair; in which the checker walls are thoroughly bonded together; and in which the checker walls are bonded to the outer walls in such a manner that the checker walls may be taken down and replaced withoutweakening the outer walls andwithout removal of the shell or bridge walls. The checker walls are also supported by arches and piers particularly arranged to uniformlydistribute the flow of and to affo d easy access for cleaning.

A further object is to construct the com llll tl0l1 chamber walls with independently remo able courses of brick at different elevations whereby burnt-out portions thereof may be replaced without disturbing adja cent courses of brick.

In the accompanying drawings, Figure l is a central vertical section on a reduced scale of the top, bottom and an intermediate portion of my improved hot blast stove. Fig. 2 is a perspective view of a part of the checker walls. Fig. 3 is a vertical Section through the base part of the stove on line 3- Fig. 1. Fig. -.t is a cross section of the stove on irregular line 2 2, Fig. 3, showing one-half of the stove on a line through one course of checker bricks and the other half through the subjaccnt course of bricks; and Fig. 5 is a cross section of the stove on the same irreguiar line but with the checker walls rem-ovial. Fig. (3 is a cross section on the irregular line (S -6, Fig. 3,

Specification of Letters Patent.

Patented May 25, 1915. Serial No. 755,632.

showing the girders and arches in plan at one side of the median line and the piers in cross section at the other side.

The furnace or stove in detail comprises a circular jacket or outer wall 2 braced internally by a curved bridge wall 3 which divides the interior of the stove vertically into a combustion chamber 4; and a heating chamber 5, the latter being subdivided by checker walls (5 to provide a large number of vertical flues and the greatest possible heating surface obtainable within the circumscribed area. The top of the stove is inclosed by a dome 7, and the outer wall is inclosed by a. metal shell 8, as usual.

Checker walls (3 rest on short girders 9 and beveled arches 10 which are supported by rectangular piers 11. A hot blast duct 12 communicates with the bottom of combustion chamber l, and this chamber also has other communicating passages extending through its outer wall. passage 1% being adapted for use with a gas burner (not shown) and passage 15 providing an air inlet for chamber 4. The base of the stove beneath l'ieating chamber 5 is also provided with a series of openings 16 radially thereof to give access to the interior in cleaning out and removing dust accumulations. A rear opening 17 provides a cold blast connection, and the openings 18 and 19 are used for chimney valve and air relief connections. The piers 11 are arranged in parallel rows with intersecting galleries 12 therebetween through which the gasesare uniformly distributed and whereby convenient access to every inside base portion of the stove may be had by way of the radial openings in the outer wall 2. The arches 10 extend from the bridge wall 3 to the rear of the stove and tho girders 9 are arranged at right angles thereto and the top of each arch is beveled at one side (Fig. 3) to widen the communieating space with the checker lines.

The checker walls are built of G"X3"x9 fire brick laid on the 3X face and bonded as follows: Thus assuming one course of checker bricks to include all the bricks laid in the same horizontal plane over the entire cross sectional area of the the heating chamber this course is built up by bricks a laid end to end in parallel rows at right angles to the median line m' m, Fig. 4. of the stove and by spacing bricks I) laid in parallel lines at right angles to the rows of bricks a. The

I ends of bricks a abut against one another,

whereas theends of bricks b abut against the side faces of bricks a in every instance. The superposed course of bricks differs however from the foregoing (see upper half of Fig. 4:) in that the bricks a which abut end to end are laid in rows parallel with the median line m-m and therefore at right angles to the subjacent rows of bricks a, and which also places the spacing bricks b in the superposed course at right angles to the rows of spacing bricks b in the said subjacen't course. This bonds the bricks at right angles in alternative courses, the spacing bricks b as superposed being at right angles and staggered in respect to one another. The result is a complete tie or bond between all the checker brick to effectively resist vibration and prevent breakage and the filling up of the fines with broken pieces of brick. The checker brick is also bonded or tied with the outer wall 2 and the bridge wall 3 without cutting or fitting or the requirement of special forms of brick and theparticular construction of the outer wall 2 which permits the result to be accomplished is as follows: The bricks for the outer wall are the same size and kind as the checker brick, but are laid for the most part on the 6"x9" faces two superposed courses of bricks, it will be instead of the 3" edge thereof: This'provides two layers of bricks in the outer wall to each layer of checker brick, and that particular portion of the outer wall which incloses heating chamber 5 has the bricks thereof laid in straight rows parallel with the rows of the bonding bricks a of the checker walls. In fact outer wall 2 also includes 3x6x9" bricks a laid on their 3" edge as extensions of the rows of the checker bricks" a, and by referring to Fig. 4 which shows seen that the bricks a which correspond to one course of the checker walls are laid at right angles to the bricks a which correspond to the other higher or. lower course. The filler bricks b in wall 2 may be either 3x6x9 bricks laid on their 6 face or 3x4% x9" laid on'their 4%." face.

The outer surface of wall 2 is rounded, but the inner part 'is built up to provide pilasters 20 extending thefull length of the stove, whereby the circular wall is greatly strengthened and made self-sustaining. The right-angled faces of the pilasters embody the bonding bricks a and a, whereby the checker walls are firmly tied to the outer wall 2 but without special cutting or fitting. Stated in another way, the flat faces of the pilasters are at right angles to each other and flush with the checker walls and have the bonding bricks a and a inset in said faces. The advantage of the pilastered. wall and checker wall constructed as described is manifold; first, that no special form of brick is required, ordinary stock brick being all that is necessary to construct or repair the stove; second, that the.-checker walls are firmly bonded together; third, that the checker walls can be removed and replaced without tearing down or weakening the outer wall 2; and fourth, that new checker walls may be built up with as strong an interlocking union with the original wall-as formerly and without bracing thewalls.

In view of the curvature ofbridge wall 3, the outer wall 2 is built in to conform there to where joined therewith, and the built-in 2 portions 21 and 22 may also be regarded as pilasters for the bridge wall an'dwith the same bonding advantages for the checker walls as in the other instance. Curved bridge wall 3, and the segmental po tion of wall 2 outer lining of bricks laid on radial lines.

mately twenty-two or twenty-three inches for a height of twenty feet, and it is the lining of this part of the bridge wall and the oppositechamber wall that is directly exposed tothe hottest blasts and therefore more likely 'to burn out, particularly the -which forms the outer wall of the combustion chamber 4:, are built up by manner and The thickness of bridge wall 3 is approxiportions marked 24 and 25. Consequently these walls are built of standard brick 9x6x3" for five courses, more-or less, and

every sixth course is made of header bricks 1 26 approximately 131} inches in length which are bonded with the bricks forming the outer lining. This construction permits convenient removal and replacement of the mner lining between any two courses of header bricks 26 withoutinjury to the restfof'the wall and without risk to workmen in making repairs. f

The reference numerala denotes the ex tension of the right angled walls a and b into the outer wall of the stove, and the me erence numeral b the bricks or units from which the outer wall is built.

What I claim is:

1. A hot blast stove of circular form hav-i ing an outer wall and a segmental-bridge wall of brick to provide combustion andheating chambers, said heating chamber having checker walls of rectangular bricks having a width exactly double'their thickness laid at right angles to each other on their narrow faces and located between said outer wall and said bridge wall, and the outer wall built up of rectangular bricks havifig a thickness of equal thickness to said checker brick laid on their wide faces in double .17 a) ll courses in bonded relations with'each other I and the checker bricks and having the lines v0f checker bricks extending into the same.

2. In a hot blast stove, checker walls formed of rectangular 9 inch x 6 inch x 3 inch brick laid on their narrowedge in right angled rows in bonding and spaced relations to pro vide vertical flues with vertical walls as thin as one brick, and an outer Wall comprising In testimony whereof I aifix my signature superposed rectangular bricks 9 inch x 6 inch in presence of two witnesses. x 3 inch laid at right angles on their narrow edges as extensions of said checker Walls, PATRICK BROWN 5 and double layers of rectangular filler bricks Witnesses:

of 3 inch thiclmess laid between said exten- F. C. MUssUN, sion of each course of checker bricks. G. F. FRANKE. 

